Algo Extensions

Additional coding problems that build on the Algo Kernel for deeper interview prep.

46 problems•17 sections

Difficulty

Problem	Difficulty	Video
Roman To Integer	easy
Longest Palindrome	easy
Find All Duplicates in an Array	medium	-

Problem	Difficulty	Video
Permutation in String	medium	-

Problem	Difficulty	Video
Largest Number From Given Numbers	medium
Sort Characters By Frequency	medium	-

Problem	Difficulty	Video
Implement stack using queues	easy	-
Implement Queue using Stacks	easy	-
Next Greater Element 1	easy	-
Baseball Game	easy	-
Asteroid Collision	medium	-

Problem	Difficulty	Video
Search Insert Position in sorted array	easy	-
Find first and last positions of target element in sorted array	medium	-
Capacity To Ship Packages Within D Days	medium	-

Problem	Difficulty	Video
Remove duplicates from Sorted List 1	easy
Intersection of Two Linked Lists	easy	-
Remove Linked List Elements	easy	-
Palindrome Linked List	easy	-
Middle of the linked list	easy
Swap Nodes in Pairs	medium	-

Problem	Difficulty	Video
Symmetric Binary Tree	easy	-
Convert Sorted Array to height-balanced Binary Search Tree	easy
Path Sum 1 - Check if root to leaf path exists	easy	-
Merge Two Binary Trees	easy	-
Flatten binary tree to linked list in order of preorder traversal	medium	-
Replace Words	medium	-
Count Good Nodes in Binary Tree	medium	-

Problem	Difficulty	Video
Seat Reservation Manager	medium	-
Minimum Cost to Hire K Workers	hard

Problem	Difficulty	Video
Surrounded Regions	medium	-
Max Area of Island	medium	-
Open the Lock	medium	-

Problem	Difficulty	Video
Regular Expression Matching	hard	-
Distinct Subsequences	hard	-

Problem	Difficulty	Video
Minimum Triangle path sum from top to bottom	medium	-

Problem	Difficulty	Video
Merge Triplets to Form Target Triplet	medium	-

Problem	Difficulty	Video
Summary Ranges	easy	-

Problem	Difficulty	Video
Plus One 1 - Given number as array plus one	easy	-
Happy Number	easy	-
Multiply Strings	medium	-
Implement Power Function 1	medium	-
Detect Squares	medium	-

Problem	Difficulty	Video
Add Binary Strings	easy	-
Reverse Integer	medium	-

Problem	Difficulty	Video
Matrix Diagonal Sum	easy	-

Problem	Difficulty	Video
Evaluate Division	medium	-

Algo Extensions - K5KC | K5kC